Definition. A metric space is a set X together with a function d (called a metric or distance function) which assigns a real number d (x, y) to every pair x, y X satisfying the properties (or axioms): 1  d (x, y) 0 and d (x, y) = 0 x = y, 2  d (x, y) = d (y, x),
Here are some facts and guidelines about formaldehyde in plywood and OSB that can help you when building a chicken coop: 1  Formaldehyde is used in the binders and resins of some manufactured wood products. 2  Offgassing can be an issue with products containing urea-formaldehyde (UF) resins.
Oriented Strand Board (OSB) is a man-made product created from wood bits, which are pressed and bound together by adhesive resin and glue. Itâs like the turkey loaf of building materials.This humble stuff is mostly used as a substrate during construction projects, leaving other materials to bask in the spotlight.on: Although some OSB comes with a water resistant covering, every subsequent cut opens up the new edges to moisture, making it prone to swelling when wet. It dries a lot slower than plywood as well. Make sure to waterproof every newly exposed section.